KR20050017071A - Muffler - Google Patents

Abstract

PURPOSE: A structure of a muffler is provided to reduce noise from dispersion of noise frequency by dividing the muffler case into five chambers with plural baffles, mounting sound absorbing materials at both sides of the muffler case and flowing exhaust gas in the muffler case. CONSTITUTION: A muffler is composed of a case closed by an end plate(2), first, second, third and fourth baffles(3-6) vertically installed in the case to divide the case into first, second, third, fourth and fifth chambers, an inlet pipe connected to the exhaust pipe, contacted to the third baffle through the end plate and composed of holes(12), a large diameter flow hole(13) formed in the second baffle to flow exhaust gas from the inlet pipe through the third chamber to the second chamber, a flow pipe(14) formed between the second baffle and the third baffle to flow exhaust gas from the second chamber to the fourth chamber, and an outlet pipe(15) arranged in a line with the inlet pipe, protruded into the fourth chamber and composed of a divergent inlet to discharge exhaust gas from the fourth chamber out of the case.

Description

Muffler Structure {Muffler}

The present invention relates to a muffler structure, and in particular, while exhaust gas flows through a case formed on the basis of the principle of countercurrent silencer, noise is reduced by the scattering effect of noise frequencies, and exhausted by sound absorbing materials formed on both sides of the case. The present invention relates to a muffler structure in which noise is further reduced to effectively attenuate exhaust noise, thereby satisfying noise regulation regulations for the muffler.

In general, the muffler is to effectively reduce the exhaust noise of the exhaust gas discharged from the engine to reduce the noise flowing to the outside.

Currently, each country regulates the level of exhaust noise emitted from the muffler, and the level is gradually decreasing.

4 shows a conventional muffler structure,

An input pipe 31 through which exhaust gas flows is formed on one side of the sealed case 30, and an output pipe 33 through which exhaust gas is discharged is formed on the other side of the case 30, and the input pipe 31 and The body portion of the output pipe 33 is present side by side, and a plurality of discharge holes 32 and inlet holes 34 are formed in the input pipe 31 and the output pipe 33, respectively, and flow into the input pipe 31. The exhaust gas is allowed to flow to the output pipe 33 through the holes 32 and 34, and the sound absorbing material 35 is formed to partially surround the input pipe 31 and the output pipe 33. Configuration.

However, the conventional muffler structure simply attenuates the exhaust noise during the passage of the exhaust gas introduced into the input pipe 31 through the plurality of holes 32 and 34, and also reduces the noise of the input pipe 31 and the output pipe 33. Since the exhaust noise is attenuated depending on the sound absorbing material formed on the way, there is a problem in that the exhaust noise attenuation efficiency is lowered.

In addition, since the exhaust noise regulation of each country is gradually lowered, the conventional muffler has a problem that does not satisfy the noise regulation of each country.

Accordingly, the present invention for solving the above problems is to form a plurality of partitions in the muffler case so that the inside of the case is partitioned into the first to fifth chamber, the sound absorbing material for attenuating exhaust noise in the first and fifth chambers on both sides The exhaust pipe introduced through the inlet pipe is discharged to the outside through the outlet pipe via the third chamber → the second chamber → the fourth chamber, so that the exhaust gas is formed in accordance with the principle of countercurrent silencer. The noise is reduced by the scattering effect of the noise frequency as it flows, and the exhaust noise is further reduced by the sound absorbing materials formed on both sides of the case, so that the exhaust noise is effectively attenuated to satisfy the noise regulation regulations for the muffler. It is an object to provide a muffler structure.

The present invention for achieving the above object,

A case sealed by an end plate coupled to both sides;

First to fourth barrier ribs installed in the case in a vertical direction to partition the case into first to fifth chambers;

An inlet pipe formed through the end plate of one side such that the outlet side thereof is opposed to the third baffle while being connected to the exhaust pipe, and the porous hole is formed on the outer periphery of the outlet side;

A large flow hole having a diameter formed on the second baffle such that the exhaust gas introduced into the third chamber through the inlet pipe flows into the second chamber;

A flow pipe formed between the second baffle and the third baffle to allow exhaust gas existing in the second chamber to flow into the fourth chamber;

An outlet pipe installed in parallel with the inlet pipe and having an inlet side protruding into the fourth chamber to discharge the exhaust gas flowing into the fourth chamber to the outside of the case;

Characterized in that consisting of.

In the meantime, a plurality of holes are formed in the first baffle and the fourth baffle so that the noise frequency is perpendicular to the sound absorbing material, respectively, and the first and second sound absorbing materials are formed in the first and fifth chambers, respectively. It is characterized in that to effectively reduce the noise of the exhaust gas flowing to the fourth chamber.

In addition, a cap is enclosed in the middle of the outlet pipe, a third sound absorbing material is embedded in the cap for noise reduction, a plurality of holes are formed in the outlet pipe on which the cap is formed, and the cap is present in the third chamber. It is characterized by.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, FIGS. 1 to 3.

Reference numeral 1 denotes a case forming the outer shape of the muffler, and end plates 2 are respectively coupled to both sides of the case 1 to be sealed.

Square first to fourth baffles 3 to 6 are formed vertically in the case 1 so that the inside of the case 1 is divided into first to fifth threads. The width is formed to be narrower than other areas.

Reference numeral 11 denotes an inlet pipe which is connected to the exhaust pipe and supplies the exhaust gas into the case 1, wherein the inlet pipe 11 is connected to the end plate 2 of one side as shown in FIGS. 1 and 2. The inlet pipe 11 is formed so that the outlet side of the inlet pipe 11 abuts against the third baffle 5, and the plurality of first porous holes 12 are formed on the outer peripheral surface of the outlet side of the inlet pipe 11, thereby providing an inlet. The exhaust gas supplied through the pipe 11 is diffused into the third chamber through the first porous hole 12, and a part of the exhaust noise flowing into the muffler is reflected to the engine side as it hits the third baffle 5, thereby externally. To reduce the noise level discharged.

By providing a structure that reflects exhaust noise to the engine side at the inlet of the muffler, the amount of exhaust noise flowing into the muffler is reduced, and exhaust noise can be effectively reduced inside the muffler.

In addition, the second baffle 4 forms a flow hole 13 having a relatively large diameter so that the exhaust gas supplied to the third chamber can flow to the second chamber, so that the exhaust gas can flow through the flow hole 13. The exhaust noise is reduced while the exhaust noise frequency is scattered by the counterflow silencer principle during the flow to the second chamber.

A flow tube 14 is formed between the second baffle 4 and the third baffle 5 to allow the exhaust gas of the second chamber to flow into the fourth chamber. As the flow from the chamber to the fourth chamber, the exhaust gas has a counterflow silencer structure with a simple expansion and noise reduction effect.

On the other hand, the reference numeral 15 denotes an outlet pipe for discharging the exhaust gas to the outside of the case 1, the outlet pipe is formed in parallel with the inlet pipe 11, as shown in Figs. The inlet side protrudes into the fourth chamber so that the exhaust gas introduced into the fourth chamber can be discharged to the outside through the outlet pipe 15.

At this time, the inlet of the outlet pipe 15 is close to the fourth baffle 6 to reduce the exhaust noise.

In this case, the back pressure is increased, and the inlet of the outlet pipe 15 is formed in the shape of a fallopian tube to solve this problem. This structure is a structure in which exhaust noise reduced by being vertically incident on the second sound absorbing material 10 through the plurality of holes 8 of the fourth baffle 6 is incident at the inlet of the outlet pipe 15 and discharged to the outside. to be.

In the present invention, a plurality of sound absorbing materials are installed in the case 30.

That is, as shown in the drawing, the first and second sound absorbing materials 9 and 10 are formed in the first chamber and the fifth chamber, respectively, and the plurality of holes (1) are formed in the first baffle 3 and the fourth baffle 6. 7,8) was formed so that the exhaust noise of the exhaust gas flowing through the second chamber and the fourth chamber is absorbed and reduced by the first and second sound absorbing materials 9,10.

In addition, in the middle of the outlet pipe 15, a cap 17 is put on the outside of the outlet pipe 15 located in the third chamber, and the exhaust noise is absorbed inside the cap 17. The third sound absorbing material 18 is embedded, and the outlet pipe 15 is formed with a plurality of holes 19 through which exhaust gas can be supplied to the sound absorbing material 18, and the numeral 16, which is not described, denotes the second seal. The second porous hole 16 is formed in the outlet pipe 15 to be present in the.

Referring to the operation of the present invention configured as described above is as follows.

The exhaust gas discharged from the engine by driving the engine flows through the exhaust pipe to flow into the inlet pipe 11, and the exhaust gas introduced into the inlet pipe 11 is formed in the first porous hole 12 formed at the outlet side. The exhaust noise is diffused into the third chamber, and at this time, the exhaust noise hits the blocked third baffle (5) and is installed at the inlet of the muffler to reduce the amount of exhaust noise coming into the muffler. Is reduced.

In addition, when the exhaust gas diffused into the third chamber flows back to the second chamber through the flow hole 13, noise noise is scattered and exhaust noise is reduced, and the exhaust gas flows from the flow hole 13 to the second chamber. Noise is reduced while the exhaust gas simply expands in the process, and the exhaust gas supplied to the second chamber flows toward the first sound absorbing material 9 through the hole 7 formed in the first baffle 3. This is absorbed by the first sound absorbing material 9 and is reduced.

On the other hand, the exhaust gas supplied to the second chamber flows back to the fourth chamber through the flow pipe 14, and at this time, the exhaust gas flows back from the second chamber to the fourth chamber, thereby simplifying the expansion of the exhaust gas and the counterflow silencer structure. As a result, exhaust noise is reduced, and the exhaust gas introduced into the fourth chamber flows to the second sound absorbing material 10 through the hole 8 formed in the fourth baffle 6, and in this process, exhaust noise is reduced. It is absorbed by the second sound absorbing material 10 and is reduced.

At this time, the inlet of the outlet pipe 15 is close to the fourth baffle 6 to reduce the exhaust noise. In this case, an increase in back pressure causes an inlet of the outlet pipe 15 in the shape of a fallopian tube. This structure is perpendicular to the second sound absorbing material 10 through a plurality of holes 8 of the fourth baffle 6. Only the exhaust noise incident and reduced is incident to the inlet of the outlet pipe 15 and is discharged to the outside.

In addition, the exhaust gas supplied to the fourth chamber is discharged to the outside of the case 1 through the outlet pipe 15. At this time, the exhaust noise is discharged by the third sound absorbing material 18 formed in the middle of the outlet pipe 15. It will decrease again.

As described above, the muffler structure of the present invention has a backflow type silencer structure with a large noise reduction effect, and exhaust noise is significantly reduced by the sound absorbing materials formed on both sides of the case 1, thereby suppressing noise discharged to the outside of the muffler. It can be reduced efficiently.

As a result of experimenting with the muffler of the present invention, it was confirmed that the noise discharged to the outside of the muffler was reduced to about 80.9 dB, and the result is a value that satisfies the noise regulation regulations (81 dB) of each country, which is scheduled for 2004. .

In addition, when the muffler of the present invention is applied to a vehicle, it is possible to remove the noise package such as the sound absorbing material installed in the undercover of the transmission, the engine undercover, and the radiator undercover due to the effective attenuation of exhaust noise. In addition to reducing the cost of production of the product can be lowered.

As described above, the present invention forms a plurality of partition walls inside the muffler case so that the inside of the case is partitioned into first to fifth chambers, and a sound absorbing material for attenuating exhaust noise is formed in the first and fifth chambers on both sides. The exhaust pipe flowing through the inlet pipe is discharged to the outside through the outlet pipe via the third chamber → the second chamber → the fourth chamber, and the exhaust gas flows through the inside of the case formed according to the principle of the backflow silencer. The noise is reduced by the scattering effect of the frequency, and the exhaust noise is further reduced by the sound absorbing materials formed on both sides of the case, so that the exhaust noise is effectively attenuated to satisfy the noise regulation regulations for the muffler. You can expect the effect to provide.

1 is a perspective view showing the interior of the muffler structure of the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a cross-sectional view taken along the line B-B in FIG.

4 is a view showing a conventional muffler structure.

※ Explanation of code for main part of drawing

1 case 2 end plate

3 ~ 6: Baffle 7,8: Hole

9,10: sound absorbing material 11: inlet pipe

12: first porous hole 13: flow hole

14: flow pipe 15: outlet pipe

16: 2nd hole 17: cap

18: sound absorbing material 19: hole

Claims (4)

A case 1 sealed by an end plate 2 coupled to both sides; First to fourth partitions 3 to 6 installed in the case 1 in a vertical direction to partition the case 1 into first to fifth chambers; The inlet pipe is formed through the end plate 2 on one side so that the outlet side thereof faces the third baffle 5 while being connected to the exhaust pipe, and the porous hole 12 is formed on the outer periphery of the outlet side. 11); A large flow hole 13 formed on the second baffle 4 so that the exhaust gas flowing into the third chamber through the inlet pipe 11 flows into the second chamber; A flow tube (14) formed between the second baffle (4) and the third baffle (5) to allow the exhaust gas present in the second chamber to flow into the fourth chamber; An outlet pipe 15 installed in parallel with the inlet pipe 11, the inlet side of which protrudes into the fourth chamber and discharges the exhaust gas flowing into the fourth chamber to the outside of the case 1 in the form of a fallopian tube; Muffler structure, characterized in that consisting of. The method of claim 1, A plurality of holes 7 and 8 are formed in the first baffle 3 and the fourth baffle 6, respectively, and first and second sound absorbing materials 9 and 10 are formed in the first chamber and the fifth chamber, respectively. Muffler structure characterized in that to reduce the noise of the exhaust gas flowing into the second chamber and the fourth chamber. The method of claim 1, A cap 17 is covered in the middle of the outlet pipe 15, and a third sound absorbing material 18 is embedded in the cap 17 to reduce noise, and a plurality of the outlet pipe 15 has the cap 17 formed therein. Muffler structure characterized in that the hole 19 is formed. The method of claim 3, wherein Muffler structure, characterized in that the cap (17) is present in the third chamber.